Blower



Jan. 6, 1931.

E. L. ANDERSON anowsa Filed llamh 291 1929 '2 Shoots-Sheet 1 ATTORNEY? Jan. 6; 1931. l

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W H KJ 3v ATTORNEY Patented 1.... 6, 1931 UNITED STATES. PA'rsNT OFFICE EDWARD I. ANDERSON, OF GROSSE ILE, MICHIGAN, ASSIGNOR TO AMERICAN BLOWER CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE,

BLOWER My invention relates to blowers.

It is the object of my invention to provide in a constant speed blower driven by a standard constant speed motor means of varying the air output without disturbin the speed of the motor and without inter ering with the passage of air through the inlet or the out-- let of the blower casing.

In particular, it is my object to provide a blower having a constant speed fan in which there 1s provided means for insuring complete uniform distribution of inlet air over the buckets or blades of the fan'while ad justably controlling the effective area of operation of the air on the buckets or blades.

- Referring to the drawings:

Figure 1 is a side elevation from the inlet side of the fan;

Figure 2 is a section on the line 2-2. of

g Fi ure 1.

ingas at 5 and an outlet opening as at 6.

. Mounted within the casing and turning freely therein is a high speed fan consisting of a disk 7 mounted on. a hub 8 which is in turn carried by a shaft 9 operated from any 3 suitable source of power preferably a constant speed motor. I

This disk 7 carries a plurality of fan blades 10, the longitudinal axis of which is parallel to the longitudinal axis of the shaft 9. -The 35 inlet ends of these blades are connected together by a flaring shroudring 11, which is arranged in overlapping spaced relationship with respect to the flared end 12 of the inlet 'tube 13 for the inletair.

the delivery of air to a point just withinthe shroud 11 and closely'adjacent to the inner margins of the fan buckets or blades 10.

By reason of-the back pressure of air with- 5 in the casing. particularly in the area desig- This inlet tube with its flared end forms a Venturi throat for Application filed March 29, 1929. Serial No. 851,!)78.

nated 14, I am enabled to deliver a stream of back pressure air through the opening 15 between the, flaring inlet= mouth 12 and the f shroud 11. This 'relieves tt re back pressure preventing eddies about. theshroud end of the blades 10 and, induces by the injector ac-' tion the flow of inlet air adjacent the shroud.

thus insuring even distribution of inlet air I over the buckets. I W

In order to-control the outlet of air from the fan without hinderin the inlet of air or hindering the outlet ,0 air at the outlet end and without changipg thefan speed, I provide the'following means.

A stationary tubular member 16 is'mounted within the casing surrounding and spaced from the fan and inlet tube 13.- 'Slidably mounted on this casing is a sliding tube 17, the free end of which as at 18 may be adjzustably positioned with respect to the disk of the fan. The distance between the end 18 of this sleeve 17 and the disc 7 will determine the. efiective area through which air worked upon by the fan can make its exit radially intothe scroll casing and thenceout the opening 6.

I am therefore able to by adjusting the sleeve 17 secure the result desired. This result is a uniform and constant one because I have provided means of equally distributing all of the incoming air over the fan blades 10. 7

Hence, the adjustment of the sleeve 17 will give a known and predetermined result in the quantity of air desired in proportion to the position of fan blades that are thus ex posed.

- It will be understood that I desire to comprehend within. my invention such modifications as may be necessary to adapt it to varying conditions and uses.

. Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent, is:

p 1. In combination, a fan housing having inlet and exit openings, a fan therein, and means for limiting the amount of air making its exit from the fan and causing a part or fall of the .air to recirculate through the an. v

2. In combination, a fan housing having inlet and exit openings, a fan therein, and means for limiting the amount of air making its exit from the fan and causing the recirculation of the air through the fan, said means being located within the housing between the inlet and exit openings.

upon the inlet air as the back pressure air flows between the inlet tube and the shroud.

9. In combination, fan casing, a constant speed side inlet and radial delivery fan, a Venturi tube extending into the interior of said fan, and an adjustable tube supported by and insaid casing closely adjacent the exterior of said fan for controlling the radial delivery of air therefrom.

In testimony whereof, I afiix my signature,

EDWARD L ANDERSON.

3. In combination, a fan housing having inlet and exit openings, a fan therein, and means for limiting the amount of air making its exit from the fan and causing the air to recirculate through the fan, said means being located within the housing between the inlet and exit openings and surrounding the fan. 1

4. In combination in a blower of a blower housing, a fan rotating therein and a sleeve adjustably positioned around the periphery laterally thereof to regulate the quantity of ing therein, means for delivering air to the interior of said fan which delivers air radially thereof, and means Within said housing a for controlling the amount of air radially delivered and for diverging part of the air back to recirculate through the fan, said means being adj ustably positioned axially of said fan exteriorly thereof.

7 In" combination, a'casing, a fan having a side inlet and radial delivery rotating an air inlet tube projected within therein, said fan, a shroud on the inlet side of said fan in spaced but overlapping relationship to the inner end of said inlet tube, a disk on the other end of said fan and an adjustable enclosure for the exterior of said fan for'regulating the flow of air radially therefrom.

8. In combination, a-casing, a fan having a side inlet and radial delivery rotating therein, an ,air inlet tube projected within said fan, a shroud on the inlet side of said fan in spaced but overlappin relationship to the inner end of said inlet tu e, a disk on the other end of said fan for regulating the flow of air radially therefrom, a stationary en- .closure. surrounding the inlet tube and said shroud adjustably and an adjustable fan enclosure supported by said stationary enclosure whereby back pressure air on the interior of said enclosures will have an injector action 

